William j



W. J. STEVENS.

BALANCE SLIDE VALVE.

Patented Jan. 18, 1887.-

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v at II I XVILLIAM J. STEVENS, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO DAVID A. HOPKINS, OF PARK RIDGE, NEW' JERSEY.

BALANCE SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 356,173, dated January 18, 1887.

Application filed October 30, 1886. Serial No. 217,557. (No model.)

To all 1071 0722, it may concern.-

Be it known that I, WILLIAM JAY STEvENs, a citizen of the United States of America, and a resident of the city, county, and State of New York, have invented a certain new and useful Improvement in Balance Slide Valves, of which the following is a specification.

This invention relates to the combination, in balance-valves with two opposite vertical slidevalve seats, constructed on the steam or pressure cylinder and provided with suitable inlet and outlet ports from said cylinder and opposite vertical slide-valves, and a connectingyoke or cross-head from the valve-rod to operate both together, of a pressure stop-plate at the top and a pressure stop projection orstud through the exhaust-port between and from one valve to the opposite, to construct and balance the pressure in the chest upon the valves against their seats.

In the drawings hereto annexed, Figure 1 represents a lateral vertical section of a steam or pressure chest through the exhaust-port of the cylinder, with the balance-valves constructed according to my invention. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a horizontal section taken through the ports of the same. Fig. 4 is a detached top view of the valves and seats of the same.

A represents the steam-chest seat and portion of the steam or pressure cylinder on which the ports and chests are applied.

B is the side case, and O the cover of the chest.

D represents the steam or pressure supply pipe attached to the cover.

E represents the hollow upward longitudi 'nal projection within the chest, having two opposite vertical longitudinal sides for valveprojection E, with the inlet-ports K K in the v ward the seat, to allow the communicating passage from the inlets alternately to the common exhaust-port. Toward the valve-rod L each valve has a forward-projecting flat nose, M, which has a lateral notch, N, on its bottom side. The end of the valve-rod L within the chest has the lateral cross-head or yoke 0 projecting with its ends under the nose M, engaging with an upward-projecting tooth, I, into the notch N of the nose of each valve, so thatuby means of said cross-head both valves are reciprocated together. Said valve-rod passes through a suitable stuffing-box on the chest. In each concave portion G of the valves are provided opposite hubs Q Q, and a lateral stud, R, is secured with a shank, f, in the hub Q of one of the valves, and passing through both exhaust-ports to come in contact with its loose end with the hub Q of the opposite valve, so as to'counteract the pressure of the valves upon their seats at their lower portion. To counteract the pressure upon the valves at their upper portion, I provide a flat plate, S, between the valves above the projection E. The opposite upper portions of the valves are for said plate S planed to recede from the bearing-surface, to allow a shoulder, T, on each for resting said plate a little above the top of the projection E, to admit the steam between said plate and the projection E, and above said longitudinal plate S is employed a lateral plate, U, for the purpose of locking the plate S longitudinally from sliding out of place. The top of each valve has an opposite lateral notch, V, in which the ends or tenons b of the plate U engage, and the portion of said plate U between the valves is fitted and engages between two lateral ribs, W \V, projecting on the top side of the plate S. By this means said plate S is held from dislocating.-

By the above construction of the balancevalve great convenience is obtained to repair or adjust the proper bearing of the valves against their counteracting-stops and to the valve-seats. Such repair or adjustment is frequently required with cylinders and slidevalves of high-speeded engines on account of the rapid travel of the valves, and their consequent wear of the valves upon their seats, causing a leakage at the bearing-surfaces of the valves. To have access to the valves in such case, the cover is first removed, the plate U and the plate S are simply raised and removed from their seats, and thereupon the valve in contact with the end of the stud R can be raised and removed from the chest. The bearing-surface of the hub Q in contact with the stud R of the removed valve is now of the base of the projection E.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In balance slide-valves, the construction and combination, with the vertical opposite valves G and their seats F, of the counteract ing top plate, S, and a stop or stud, R, pro vided substantially as and for the purpose herein set forth.

2. The combination, with the projection E, its ports I and K, the valves G, and their seats F, of the counteracting-plate S and stud or stop R, through the exhaust-ports and said plate S, with its locking-plate U, and the valves G G, with their notched noses M, and the crosshead 0, with the rod L, substantially as and for the purpose herein shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this th day of October, 1886. 7

WM J. STEVENS.

\Vitnesses:

CHAS. E. LANSING, REINHOLD BOEKLEN. 

